Overloding "add" operator

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C++

OOP

Hi,
I am new on this site, i have some issues about OOP in C++ operator overloading.
I try to do add a two numbers using overloading operator "+" in more ways :

1). First way is : const Point operator+(const Point& point) const.
So i add two numbers in this way using an reference to Point class like parameter :

const Point Point::operator+(const Point& point) const
     {
          return Point(this->x + point.x, this->y + point.y);
     }

This variant works.

2). Second way is : const Point operator+(const int Value) const.
I add two numbers with a constant integer value like parameter :

const Point Point::operator+(const int Value) const
     {
          return Point(this->x + Value, this->y + Value);
     }

This variant works, also.

3). The third way : const Point::operator+(const Point& point1, const Point& point2).

but this code is not ok. I receive an error :

error: 'const Point Point::operator+(const Point&, const Point&)' must take either zero or one argument.

#include <iostream>

using namespace std;

class Point
{
private:
    int x;
    int y;
public:
    Point(int x = 0, int y = 0);
    int getX() const;
    int getY() const;
    void setX(int X);
    void setY(int y);
    void print() const;
    const Point operator+(const Point& point1, const Point& point2);
};

Point::Point(int a, int b)
{
    x = a;
    y = b;
}

int Point::getX() const
{
    return x;
}

int Point::getY() const
{
    return y;
}

void Point::setX(int X)
{
   this->x = X;
}

void Point::setY(int Y)
{
    this->y = Y;
}

void Point::print() const
{
    cout << "\n x = " << x << "\n\n y = " << y <<endl<<endl;
}

const Point::operator+(const Point& point1, const Point& point2)
{
    return Point(point1.x + point2.x, point2.y + point2.y);
}

int main()
{
    Point p1(2, 8), p2(4, 5);
    Point p3 = p1 + p2;
    p1.print();
    p2.print();
    p3.print();

    Point p5 = p1 + p2 + p3;
    p5.print();
    return 0;
}